Mail will not load any help available would be apprecitated

The error message I received this morning I have used Zimbra for awhile with no issues until now...

Debug message: error while proxying request to target server: HTTP/1.1 404 Not Found

Exception:

com.zimbra.common.service.ServiceException: error while proxying request to target server: HTTP/1.1 404 Not Found
ExceptionId:btpool0-25:1357316680299:baa3d6e13cbde095
Code:service.PROXY_ERROR Argurl, STR, "https://webmail.attbizclassemail.com/service/soap/SyncRequest")
at com.zimbra.common.service.ServiceException.PROXY_E RROR(ServiceException.java:322)
at com.zimbra.common.soap.SoapHttpTransport.invoke(So apHttpTransport.java:247)
at com.zimbra.common.soap.SoapHttpTransport.invoke(So apHttpTransport.java:164)
at com.zimbra.common.soap.SoapTransport.invoke(SoapTr ansport.java:407)
at com.zimbra.common.soap.SoapTransport.invokeWithout Session(SoapTransport.java:393)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:678)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:640)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:635)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:628)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:624)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:620)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:616)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequestWithNo tification(ZcsMailbox.java:612)
at com.zimbra.cs.mailbox.DeltaSync.sync(DeltaSync.jav a:103)
at com.zimbra.cs.mailbox.DeltaSync.sync(DeltaSync.jav a:89)
at com.zimbra.cs.mailbox.MailboxSync.sync(MailboxSync .java:192)
at com.zimbra.cs.mailbox.ZcsMailbox.sync(ZcsMailbox.j ava:124)
at com.zimbra.cs.service.offline.OfflineSync.handle(O fflineSync.java:55)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEng ine.java:412)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:287)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:158)
at com.zimbra.soap.SoapServlet.doWork(SoapServlet.jav a:303)
at com.zimbra.soap.SoapServlet.doPost(SoapServlet.jav a:217)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:725)
at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:206)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:814)
at org.mortbay.jetty.servlet.ServletHolder.handle(Ser vletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(Se rvletHandler.java:390)
at org.mortbay.jetty.security.SecurityHandler.handle( SecurityHandler.java:218)
at org.mortbay.jetty.servlet.SessionHandler.handle(Se ssionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(Co ntextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebA ppContext.java:422)
at org.mortbay.jetty.handler.ContextHandlerCollection .handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle (HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.handler.rewrite.RewriteHandler.h andle(RewriteHandler.java:230)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(Htt pConnection.java:585)
at org.mortbay.jetty.HttpConnection$RequestHandler.co ntent(HttpConnection.java:988)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser. java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpPa rser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnec tion.java:415)
at org.mortbay.io.nio.SelectChannelEndPoint.run(Selec tChannelEndPoint.java:429)
at org.mortbay.thread.BoundedThreadPool$PoolThread.ru n(BoundedThreadPool.java:451)